The numbers  are written down and some of them are colored blue. A coloring is called factorific if there is at least one blue number, and for each blue number, all of its divisors are also blue.

If Grogg randomly colors some, all, or none of the numbers from 1 to 6 blue, what is the probability that his coloring is factorific?


I have found out that there are \(2^6=64\) different orders. How do I narrow it down from there?

Guest Apr 8, 2018

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Guest Apr 8, 2018

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